Like most Pokmon cards, the value of Rayquaza-EX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Roaring Skies)
Instead, always prioritize lower-cost cards that trigger desired effects off of the rest of your deck, as this is what will ultimately gain you control of the board
Since you are a red deck, of course youre doing that
This is hard to notice because of what you mentioned where the damage just appears for this attack (and a few select others in the game) without showing how much damage is dealt
Classes usually work to describe a creatures role within a specific species
Two or more creatures you control must attack the same player in order for Landroval, Horizon Witness's ability to trigger